Explain about " Static " keyword in Java?

Static Variables

•  It is a variable which belongs to the class and not to object(instance)
• Static variables are initialized only once , at the start of the execution . These variables will be initialized first, before the initialization of any instance variables.
• A single copy to be shared by all instances of the class.
• A static variable can be accessed directly by the class name and doesn’t need any object Syntax : <class-name>.<variable-name>

Static Methods

• It is a method which belongs to the class and not to the object(instance).
• A static method can access only static data. It cannot access non-static data (instance variables).
• A static method can  call only  other static methods and cannot call a non-static method from it.
•  A static method  can be accessed directly by the class name and doesn’t need any object. Syntax : <class-name>.<method-name>
• A static method cannot refer to "this" or "super"  keywords in anyway.

Static Block

• The static block, is a block of statement inside a Java class that will be executed when a class is first loaded in to the JVM

class Test{

                  static {   

                    //Code goes here

     }

   }

A static block helps to initialize the static data members, just like constructors help to initialize instance members